651870538225 has 27 divisors (see below), whose sum is σ = 816107143683. Its totient is φ = 516519709440.

The previous prime is 651870538223. The next prime is 651870538229. The reversal of 651870538225 is 522835078156.

The square root of 651870538225 is 807385.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 484406256049 + 167464282176 = 695993^2 + 409224^2 .

It is not a de Polignac number, because 651870538225 - 2¹ = 651870538223 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651870538223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 456171811 + ... + 456173239.

Almost surely, 2^651870538225 is an apocalyptic number.

651870538225 is the 807385-th square number.

651870538225 is the 403693-rd centered octagonal number.

It is an amenable number.

651870538225 is a deficient number, since it is larger than the sum of its proper divisors (164236605458).

651870538225 is an frugal number, since it uses more digits than its factorization.

651870538225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 52.

The spelling of 651870538225 in words is "six hundred fifty-one billion, eight hundred seventy million, five hundred thirty-eight thousand, two hundred twenty-five".